Chapter 11. The Muscular System. Lecture slides prepared by Curtis DeFriez, Weber State University
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1 Chapter 11 The Muscular System Lecture slides prepared by Curtis DeFriez, Weber State University
2 Location tibialis anterior Naming Muscles Tibialis anterior
3 Naming Muscles Size gluteus maximus Number of Attachments o biceps; triceps
4 Naming Muscles Location/Direction of Fibers transversus abdominus
5 Naming Muscles Styloid process Attachments (origin & insertion) o stylohyoid; sternocleidomastoid Hyoid bone
6 Muscle action levator scapulae adductor magnus tensor tympani Naming Muscles Levator scapulae
7 Combination of above Fibularis longus Naming Muscles
8 Origins and Insertions Muscles produce movement by exerting force on tendons which in turn pull on bones and other supporting structures like the skin. In order to produce movement around a joint, one bone must be stationary while another bone moves. The attachment of a muscle's tendon to the stationary, usually proximal bone, is called the origin.
9 Origins and Insertions Insertion of the long head of the biceps
10 Origins and Insertions Biceps: Origin: Scapula Insertion: Radius Action: pronate and flex the arm Triceps: Origin: Scapula near shoulder joint Upper lateral and posterior sites of humerus Posterior surface of humerus Insertion: Back of olecranon process of ulna Action: Straighten (extend) the arm
11 Musculoskeletal Levers Muscles, tendons, bones, and joints can form three different types of levers in the body. When producing movement, bones act as levers, and joints function as the fixed point of movement called the fulcrum. In a lever, the point of movement (fulcrum) is acted on by two different forces: Effort and load.
12 Musculoskeletal Levers There are few first-class levers in the body
13 Musculoskeletal Levers Second class levers always provide a distinct mechanical advantage in producing force. Like a pry bar
14 Musculoskeletal Levers Third-class levers are the most common and favor speed and range of motion over maximum force.
15 Coordination Among Muscles Movements are often the result of several skeletal muscles acting as a group. Most skeletal muscles are arranged in opposing (antagonistic) pairs at joints. Within opposing pairs, the prime mover or agonist ( the leader ) is the muscle primarily responsible for causing the desired movement.
16 Coordination Among Muscles The antagonist stretches and yields to the effects of the prime mover. In flexing the forearm at the elbow, the brachialis is the prime mover or agonists, and the triceps brachii is the antagonist.
17 Coordination Among Muscles Synergists are muscles used to prevent unwanted movements at intermediate joints, or otherwise aid the movement of the prime mover. The biceps acts synergistically with the brachialis. Fixator muscles are a type of synergist muscle that are used to steady the proximal joints of a prime mover. Shoulder stabilizers for the forearm flexors
18 Learn the origin, insertion and action of the major skeletal muscles of the body as directed by your instructor. Some of the more common muscles of the head and neck include: Orbicularis oris Extraocular muscles Sternocleidomastoid Rectus abdominus External oblique
19 The muscles of facial expression move skin rather than bones around a joint. Orbicularis oris Action: Closes and protrudes lips for kissing Origin: Surrounding the opening of the mouth Insertion: The skin at the corner of the mouth Orbicularis oris
20 Muscles that move the mandible (lower jaw) Also called muscles of mastication Masseter Origin: Maxilla and zygomatic arch Insertion: Mandible Action: Closes the mouth Masseter
21 The Extraocular muscles 3 pair give each eye very precise movement Origin: Back of the orbit Insertion: Different parts of the eyeball Action: Precise and rapid movement of the eyes
22 Muscles that move the head Sternocleidomastoid (commonly abbreviated as SCM) Origin: Clavicle and sternum Insertion: Mastoid process of temporal bone Action: Flex and rotate the head Sternocleidomastoid
23 Some of the more common muscles that originate on the trunk include: Pectoralis major and minor Anterior abdominal muscle group Latissimus dorsi Biceps brachii Diaphragm Trapezius Deltoid
24 Muscles that move the pectoral girdle (shoulder) Pectoralis major Origin: Clavicle and sternum Insertion: Proximal humerus Action: Adducts and medially rotates the arm at the shoulder joint Pectoralis minor Origin: Ribs 3 5 Insertion: Coracoid process of the scapula Action: Internally rotates the shoulder
25 Muscles that move the pectoral girdle (shoulder) Deltoid Muscle Origin: Lateral clavicle and upper scapula Insertion: Deltoid tuberosity on the shaft of the humerus Deltoid Action: Abducts, flexes, and medially rotates the upper arm at the shoulder joint
26 Muscles that move the pectoral girdle (shoulder) Trapezius Origin: Occipital bone and cervical spine Trapezius Insertion: Clavicle, scapula and lower thoracic vertebrae Action: Supports the arm and moves the scapula up, down, in, and out
27 Muscles that move the pectoral girdle (shoulder) Latissimus dorsi Origin: Thoracic and lumbar vertebrae and the iliac bone Insertion: Mid-humerus Action: Drives arm inferiorly and posteriorly (the swimmer s muscle) Latissimus dorsi
28 Anterior abdominal wall Rectus abdominis Origin: Pubic bone Insertion: Ribs and sternum External oblique Origin: Ribs 5 12 Insertion: Iliac crest and linea alba Actions: Flexes vertebral column and compresses abdomen
29 The main muscle of inspiration is the diaphragm. Origin: Inferior 6 ribs (anteriorly) and lumbar vertebrae (posteriorly) Insertion: Central tendon Diaphragm Central tendon
30 Some of the more common muscles of the extremities include: Triceps brachii Brachioradialis Thenar muscles Hypothenar muscles Gluteus maximus Biceps femoris Quadriceps group: Rectus femoris, along with the vastus lateralis, vastus intermedius, and vastus medialis Tibialis anterior Gastrocnemius Soleus
31 Muscles that move the Radius and Ulna Biceps brachii Origin: Scapula Insertion: Radius Action: Flexes and supinates forearm at elbow joint and flexes Brachialis Origin: Distal anterior surface of humerus Insertion: Ulna Action: Flexor of forearm at elbow arm at shoulder joint
32 Muscles that move the Radius and Ulna Triceps brachii Origin: Scapula and posterior surface of humerus Insertion: Olecranon process of ulna Action: Extends forearm at elbow joint and arm at shoulder joint
33 Muscles that move the Radius and Ulna Brachioradialis Origin: Humerus Insertion: Distal radius Action: Supinates the forearm at the radioulnar joint
34 Muscles that move the wrist, hand, thumb, and finger Thenar: lateral aspect of palm Hypothenar: medial aspect of palm Action: Oppose thumb against other 4 fingers Thenar Hypothenar
35 Muscles that move the femur Gluteus maximus Origin: Iliac crest, sacrum, and coccyx Insertion: Femur Action: Extends and laterally rotates thigh at hip joint Gluteus maximus
36 Muscles that move the femur, tibia, and fibula Quadricep group (Rectus femoris, vastus lateralis, vastus intermedius, and vastus medialis) Origin: Iliac spine and proximal femur Insertion: Patella and proximal tibia Action: Flexes thigh at high joint and extends leg at knee joint
37 Muscles that move the femur, tibia, and fibula Hamstring group: (Biceps femoris, Semitendinosus, and Semimembranosus) Origin: Ischial tuberosity Insertion: Proximal tibia and fibula
38 Muscles that move the femur, tibia, and fibula Tibialis anterior Origin: Tibia Insertion: First cuneiform and first metatarsal Action: Dorsiflexes and inverts the foot
39 Muscles that plantar flex the foot at the ankle joint (standing on tip toes ) Gastrocnemius and soleus muscles function as one often called the gastrocsoleus muscle Origin: Femur, capsule of knee, and head of fibula Insertion: Calcaneus by way of calcaneal (Achilles) tendon
40
41
42 Imbalances of Homeostasis Exercise-induced muscle damage After intense exercise, electron micrographs reveal considerable muscle damage including torn sarcolemmas and disrupted Z-discs. Blood levels of proteins normally confined only to muscle (including myoglobin and the enzyme, creatine kinase) increase as they are released from damaged muscle.
43 Imbalances of Homeostasis Spasm A sudden involuntary contraction of a single muscle within a large group of muscles usually painless Cramp Involuntary and often painful muscle contractions Caused by inadequate blood flow to muscles (such as in dehydration), overuse and injury, and abnormal blood electrolyte levels
44 Imbalances of Homeostasis Disease States and Disorders Fibrosis (myofibrosis) Replacement of muscle fibers by excessive amounts of connective tissues (fibrous scar tissue) Myosclerosis Hardening of the muscle caused by calcification Both myosclerosis and muscle fibrosis occur as a result of trauma and various metabolic disorders.
45 Imbalances of Homeostasis Aging In part due to decreased levels of physical activity, with aging, humans undergo a slow, progressive loss of skeletal muscle mass that is replaced largely by fibrous connective tissue and adipose tissue. Muscle strength at 85 is about half that at age 25. Compared to the other two fiber types, the relative number of slow oxidative fibers appears to increase.
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